Our society functions by separating us from each other: almost as soon as we're born, we are taught to divide people into groups and see some as more deserving (and more human) than others. Everything from massive inequality to war depends on this process of categorisation and dehumanisation. In this provocative, inspiring piece of writing, Raoul Martinez asks how and why our empathy is controlled, and argues for a very different world – one of deeper understanding and indiscriminate compassion.